<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .wrap {
            display: flex;
            width: 400px;
            height: 400px;
            border: 1px solid;
        }

        .item {
            height: 50px;
            background: pink;
            font-size: 13px;
            line-height: 50px;
            text-align: center;
            border: 1px solid;
            box-sizing: border-box;

            flex-basis: 0%;
            /* flex: 1; */
        }

        .wrap .item:nth-child(1) {
            flex-grow: 1;
        }

        .wrap .item:nth-child(2) {
            flex-grow: 2;
        }

        .wrap .item:nth-child(3) {
            flex-grow: 3;
        }
    </style>
</head>

<body>
    <div class="wrap">
        <div class="item">商品❤❤❤❤❤❤</div>
        <div class="item">评价</div>
        <div class="item">商家❤❤</div>
    </div>
</body>

</html>